[latexila] build: stop setting ACLOCAL_AMFLAGS

[Sébastien Wilmet <swilmet src gnome org>]

commit 2d35259e576ca4bb1c0237769e06bf1fb287250e
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Dec 18 16:10:41 2016 +0100

    build: stop setting ACLOCAL_AMFLAGS
    
    This is deprecated and will break with a future version of Automake.
    Also, we already call AC_CONFIG_MACRO_DIR([m4]) in configure.ac, so it's
    also useless. The downside is that it will introduce a nag warning from
    libtool, but that's a libtool bug.

 Makefile.am |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index c6ad14c..4868a6f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,3 @@
-ACLOCAL_AMFLAGS = -I m4
-
 SUBDIRS = data man po help src tests docs
 
 AM_DISTCHECK_CONFIGURE_FLAGS = --enable-gtk-doc --enable-introspection --enable-vala